CN111608015A - Preparation method of high-cleanness low-quantitative stainless steel lining paper - Google Patents
Preparation method of high-cleanness low-quantitative stainless steel lining paper Download PDFInfo
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- CN111608015A CN111608015A CN202010286056.3A CN202010286056A CN111608015A CN 111608015 A CN111608015 A CN 111608015A CN 202010286056 A CN202010286056 A CN 202010286056A CN 111608015 A CN111608015 A CN 111608015A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
- C01B33/157—After-treatment of gels
- C01B33/158—Purification; Drying; Dehydrating
- C01B33/1585—Dehydration into aerogels
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
- D21H11/04—Kraft or sulfate pulp
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/06—Alcohols; Phenols; Ethers; Aldehydes; Ketones; Acetals; Ketals
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/14—Carboxylic acids; Derivatives thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/28—Starch
- D21H17/29—Starch cationic
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/65—Acid compounds
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/69—Water-insoluble compounds, e.g. fillers, pigments modified, e.g. by association with other compositions prior to incorporation in the pulp or paper
Abstract
The invention relates to the technical field of papermaking, and provides a preparation method of a high-cleanness low-quantification stainless steel lining paper aiming at the problems of troublesome preparation and insufficient cleanliness of the low-quantification stainless steel lining paper, which comprises the following steps: the method comprises the steps of selecting 20-40% of softwood pulp and 60-80% of hardwood pulp as pulp liquid, sequentially passing the pulp liquid through a pressure screen, a three-section desander and a rotor screen, adding cationic starch at the pressure screen, arranging a multi-stage screen in the slag remover, gradually reducing the aperture of the screen, then carrying out paper making, calendaring and paper rolling to obtain stainless steel lining paper, wherein the weight of the stainless steel lining paper is below 25g, the paper is made to pass through a single-cylinder paper machine carrier roller, and the height of the single-cylinder paper machine carrier roller is 0.25-0.3 mm. The invention can ensure high cleanliness of the stainless steel lining paper while ensuring low ration through the selection of raw materials and the adjustment of equipment parameters.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a preparation method of high-cleanness low-quantitative stainless steel lining paper.
Background
Stainless interleaving paper is a special paper inserted for preventing friction between stainless steel plates during the coiling process of cold-rolled high-grade stainless steel plates. In the production process of stainless steel plates, because a rolling mill running at a high speed has high tensile strength in production, certain friction force is generated, and great influence is generated on the smoothness, refraction and brightness of stainless steel products. Therefore, stainless steel plate manufacturers have higher and higher requirements on indexes such as tensile strength, smoothness, cleanliness and the like of stainless steel lining paper.
With the continuous development of industry, the pressure of cost is taken into consideration, and low-quantitative stainless steel lining paper becomes a trend, for example, chinese patent publication No. CN206529651U discloses a high-temperature resistant stainless steel lining paper, which provides a stainless steel lining paper with simple structure, low-quantitative property and still higher strength after high temperature, and comprises a facing layer, a high-temperature resistant layer, an adhesive layer and a reinforcing layer, wherein the adhesive layer covers two sides of the reinforcing layer, the high-temperature resistant layer covers the adhesive layer, and salient points are uniformly arranged on the surface of the reinforcing layer and the surface of the high-temperature resistant layer, so that the adhesion inside the lining paper is more stable. However, the stainless steel backing paper has a large number of layers and is troublesome to prepare. In addition, after low quantification, higher requirements are put forward on the cleanliness of the stainless steel lining paper. Accordingly, an ideal solution is needed.
Disclosure of Invention
The invention provides a method for preparing high-cleanness low-quantity stainless steel lining paper, aiming at overcoming the problems of troublesome preparation and insufficient cleanliness of low-quantity stainless steel lining paper.
In order to achieve the purpose, the invention adopts the following technical scheme: a preparation method of high-cleanness low-basis weight stainless steel lining paper comprises the following steps: the method comprises the steps of selecting 20-40% of softwood pulp and 60-80% of hardwood pulp as pulp liquid, sequentially passing the pulp liquid through a pressure screen, a three-section desander and a rotor screen, adding cationic starch at the pressure screen, arranging a multi-stage screen in the slag remover, gradually reducing the aperture of the screen, then carrying out paper making, calendaring and paper rolling to obtain stainless steel lining paper, wherein the weight of the stainless steel lining paper is below 25g, the paper is made to pass through a single-cylinder paper machine carrier roller, and the height of the single-cylinder paper machine carrier roller is 0.25-0.3 mm.
The softwood pulp has the advantages of good strength, long fiber, less impurity cells, low hemicellulose content, small paper forming shrinkage, high transparency, high price and large pulping power consumption. And hardwood pulp fiber is coarse and short, contains more impurities, has relatively low paper strength, loose paper, strong absorption performance and high opacity, so that the manufactured paper has high bulk and high stiffness. The mixture ratio of the raw materials is determined to be 20-40% of softwood pulp and 60-80% of hardwood pulp through screening. The proper amount of cationic starch is added into the pulp slurry to play a role in strengthening and filter aid. The invention also limits the middle height of the single cylinder paper machine carrier roller to be 0.25-0.3mm, and the influence of the middle height of the carrier roller on paper is multifaceted: the most intuitive is the thickness influence, wherein the middle height is too large, the two sides of the paper page are thick, the middle part of the paper page is thin, the middle height is too small, and the two sides of the paper page are thin and the middle part of the paper page is thick; therefore, the interlayer bonding strength of the paper is unevenly distributed in the longitudinal direction and the transverse direction, and the strength of the paper is influenced. The invention can keep the bulk (larger than 0.033mm) of more than 30g of stainless steel lining paper under the condition of less than 25g of fixed quantity through the selection of raw materials and the adjustment of equipment parameters, and can also minimize the damage of pulp points with the diameter of less than 0.03mm to plates. The three-section desander and the rotor screen remove impurities and coarse fiber bundles, reduce small dust of paper, improve the cleanliness of the paper, enable the appearance of the paper to be cleaner and finer and smoother, and still can ensure high cleanliness under the condition that the gram weight of stainless steel lining paper is reduced.
Preferably, the softwood and hardwood pulps are bleached kraft pulps having a pulp size of 45-55 ° SR and a wet weight of 3.5-4.5 g.
Preferably, the pulp liquid is prepared by adopting a discontinuous fully-swelling pulping mode and a defibering and mixing pulping mode. Compared with the continuous pulping mode, the discontinuous pulping mode has the advantages that the pulp is stably crushed, and various parameters are easy to master and control. The grinding is carried out in the grinding machine, the front end of the rotor of the grinding machine is a cylindrical multi-tooth staggered grinding disc, conical protruding teeth are arranged on the grinding disc, matched conical protruding teeth are also arranged on the corresponding shell, and pulp liquid is ground in gaps between the protruding teeth, so that pulp points can be obviously reduced. The improvement of the pulp processing method reduces the pulp point number of the finished pulp fiber to 2/10 g of dry pulp.
Preferably, the amount of cationic starch is 1-5kg/t of paper.
Preferably, composite SiO is also added into the pulp slurry2Aerogel particles, composite SiO2Aerogel particles with the mass being 5-10% of the mass of the pulp slurry, and composite SiO2The aerogel particles are dispersed in ethylene glycol by ultrasonic wave and fully stirred with the pulp slurry for 4-6 h. The medium that is full of among the aerogel space network is gaseous, and the outward appearance is solid-like, and density is very little, can strengthen the low ration of stainless steel slip sheet and the characteristic of high bulk. Aerogel can bear pressure which is thousands of times of the mass of the aerogel, but has poor flexibility, so that the aerogel can bear SiO2The aerogel is subjected to composite modification to improve the flexibility of the aerogel. Composite SiO2The addition of the aerogel can also increase the adsorption of cationic starch and increase the strength of paper.
Further preferably, the composite SiO2The aerogel particles were prepared as follows:
calcining palygorskite at 300 ℃ under 240-fold temperature, sieving with 500-fold sieve under 300-fold temperature to obtain palygorskite powder, dissolving the palygorskite powder and benzoyl peroxide with the mass of 0.5-0.6 times of that of the palygorskite powder in toluene, performing ultrasonic reaction for 3-6h at 60-80 ℃, performing suction filtration and drying, adding a product into a sodium ethoxide solution, performing ultrasonic oscillation for 5-10h at 60-80 ℃, adjusting the reaction solution to be acidic, performing suction filtration and drying to obtain carboxylated modified palygorskite powder;
palygorskite has large specific surface area, good rheological property, viscosity and plasticity, and small shrinkage after drying. Can be used as a filler per se, but the quantitative increase of the paper is obvious if the filler is directly added in the invention. The palygorskite is calcined at the temperature of 240 ℃ and 300 ℃ to remove crystal water between the lamellae. The palygorskite is carboxylic acid modified into SiO2The binding of the gel provides conditions.
Uniformly mixing carboxylic acid modified palygorskite powder, ethyl orthosilicate and absolute ethyl alcohol, and then adding deionized water and hydrogen fluorideCarboxylic acid modified palygorskite powder:VTetraethoxysilane:VAnhydrous ethanol:VDeionized water:VHydrogen fluoride1g of (8-10) ml of (20-50) ml of (8-10) ml of (1-2), stirring the solution to be thick, and standing to obtain a composite wet gel;
the palygorskite is provided with two-dimensional continuous silica tetrahedral sheets, the ethyl orthosilicate and the carboxylic acid modified palygorskite powder are uniformly mixed and then inserted between the palygorskite sheet layers, the ethyl orthosilicate is hydrolyzed and condensed to obtain silicon dioxide colloid, the silicon dioxide colloid is filled between the palygorskite sheet layers, the strength of the aerogel is increased, and on the other hand, the palygorskite increases the flexibility of the aerogel. The silica colloid contains hydroxyl and can react with carboxyl of the carboxylic acid modified palygorskite, so that the combination of the silica colloid and the carboxylic acid modified palygorskite is firmer and dislocation is prevented.
(3) Soaking the composite wet gel in anhydrous ethanol, aging for 20-28h, filtering, drying the filter residue at 30-50 deg.C, and grinding to obtain composite SiO2Aerogel particles.
Preferably, the gel obtained in the step (3) is dried, then is immersed in a mixed solution of trimethylchlorosilane and normal hexane in a volume ratio of 1:4, the gel is taken out and naturally dried, the gel is dried at 50-70 ℃ to obtain the composite aerogel, and then the composite aerogel is ground. The gel is subjected to surface modification by utilizing trimethylchlorosilane and n-hexane, and a part of hydroxyl of the gel is converted into a hydrophobic group, so that the gel framework has hydrophobicity, the additional pressure of a capillary is reduced, and the cracking degree in the drying process is further reduced.
Preferably, the SiO compound2The aerogel particles were modified by the following treatments:
1) compounding SiO2Dispersing aerogel particles in ethylene glycol, adding sodium alkyl benzene sulfonate according to the mass ratio of (6-20) to 1, and performing ultrasonic dispersion for 0.5-1 h;
2) reacting diphenylmethane diisocyanate and polytetramethylene ether glycol at 70-100 ℃ for 2-8h in nitrogen atmosphere to generate an isocyanate group NCO-terminated prepolymer, adding 1-3 parts by weight of gelatin, and stirring for 0.5-1 h;
3) mixing the products of the first two steps, adding 10-15 parts by weight of cationic starch and 1-5 parts by weight of persulfate, stirring, reacting at 50-70 ℃ for 20-60min, centrifuging, filtering and drying to obtain modified composite SiO2Aerogel particles.
In order to further strengthen the composite SiO2The flexibility of aerogel particles is realized by firstly utilizing sodium alkyl benzene sulfonate to compound SiO2Performing surface treatment on aerogel particles to make the aerogel particles have electronegativity, and then introducing prepolymer and cationic starch into the composite SiO under the initiation of persulfate2Polymerizing the surface of aerogel particles to compound SiO2The surface of the aerogel particles is coated with a uniform layer of flexible polymer.
Therefore, the invention has the following beneficial effects: (1) through the selection of raw materials and the adjustment of equipment parameters, the stainless steel lining paper can keep the bulk of more than 30g while the quantitative amount of the stainless steel lining paper is below 25g, and the damage of a pulp point with the diameter of less than 0.03mm to a plate is reduced to the minimum; (2) the three-section desander and the rotor screen remove impurities and coarse fiber bundles, reduce small dust of paper and improve the cleanliness of the paper; (3) aerogel can enhance the low basis weight and high bulk properties of stainless steel liners, but it is less flexible, so on SiO2The aerogel is subjected to composite modification to improve the flexibility of the aerogel.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples.
In the present invention, unless otherwise specified, all the raw materials and equipment used are commercially available or commonly used in the art, and the methods in the examples are conventional in the art unless otherwise specified.
Example 1
20% of softwood pulp and 80% of hardwood pulp are selected as pulp liquid, a continuous fully-swelling pulping mode is matched with a defibering and mixing pulping mode to prepare pulp with the pulp degree of 45 DEG SR and the wet weight of 4g, defibering and mixing are carried out in a defibering machine, a cylindrical multi-tooth staggered grinding disc is arranged at the front end of a rotor of the defibering machine, conical protruding teeth are arranged on the grinding disc, matched conical protruding teeth are also arranged on a corresponding shell, and pulp liquid is defibered in gaps between the protruding teeth, so that pulp points can be obviously reduced. The paper pulp liquid with the concentration of 1% sequentially passes through a pressure screen, a three-section desander and a rotor screen, 1kg/t of paper cationic starch is added at the pressure screen, then, the stainless steel lining paper is obtained through the steps of paper making, calendaring and paper rolling, the paper making passes through a Yankee single cylinder paper machine, the shaft neck is 400mm, the diameter of the paper neck is 1:12 cone, the vehicle speed is 250 m/min, and the height of a roller of the single cylinder paper machine is 0.25 mm.
Example 2
40% of softwood pulp and 60% of hardwood pulp are selected as pulp liquid, a discontinuous fully-swelling pulping mode is matched with a defibering and mixing pulping mode to prepare the pulp with the pulp degree of 55-degree SR and the wet weight of 3.5g, and composite SiO with the mass of 5% of that of the pulp liquid is added into the pulp liquid2Aerogel particles, composite SiO2The aerogel particles are dispersed in ethylene glycol by ultrasonic wave and fully stirred with the pulp slurry for 4 hours. Then sequentially passing through a pressure screen, a three-section desander and a rotor screen, adding 1-5kg/t of cationic starch into the pressure screen, and then carrying out paper making, calendaring and paper rolling to obtain stainless steel lining paper, wherein the paper is passed through a single-cylinder paper machine carrier roller, and the height of the single-cylinder paper machine carrier roller is 0.3 mm.
The composite SiO2The aerogel particles were prepared as follows: (1) calcining palygorskite at 240 deg.C, sieving with 300 mesh sieve to obtain palygorskite powder, dissolving palygorskite powder and benzoyl peroxide 0.5 times its mass in toluene, performing ultrasonic reaction at 60 deg.C for 6 hr, vacuum filtering, drying, adding the product into sodium ethoxide solution,performing ultrasonic oscillation at 80 ℃ for 5h, adjusting the pH of the reaction liquid to 3 by using acetic acid, performing suction filtration and drying to obtain carboxylated modified palygorskite powder;
(2) uniformly mixing carboxylic acid modified palygorskite powder, ethyl orthosilicate and absolute ethyl alcohol, and then adding deionized water and hydrogen fluorideCarboxylic acid modified palygorskite powder:VTetraethoxysilane:VAnhydrous ethanol:VDeionized water:VHydrogen fluoride1g of the complex wet gel, 8ml of the complex wet gel, 50ml of the complex wet gel and 1ml of the complex wet gel, stirring the solution to be thick, and standing the solution to obtain the complex wet gel;
(3) soaking the composite wet gel in anhydrous ethanol, aging for 28h, filtering, drying the filter residue at 40 deg.C, and grinding to obtain composite SiO2Aerogel particles.
Example 3
Selecting 50% softwood pulp and 50% hardwood pulp as pulp liquid, adopting discontinuous fully-swelling pulping mode and defibering mixed pulping mode to prepare pulp with pulp degree of 50 DEG SR and wet weight of 4.5g, and adding 10% modified composite SiO by mass into the pulp liquid2Aerogel particles, composite SiO2The aerogel particles are dispersed in ethylene glycol by ultrasonic wave and fully stirred with the pulp slurry for 6 hours. Then the paper passes through a pressure screen, a three-section desander and a rotor screen in sequence, 3kg/t of cationic starch of paper is added at the pressure screen, then the stainless steel lining paper is obtained through the steps of paper making, calendaring and paper rolling, the paper is made to pass through a single cylinder paper machine carrier roller, and the middle height of the single cylinder paper machine carrier roller is 0.25 mm.
The composite SiO2The aerogel particles were prepared as follows: (1) calcining palygorskite at 300 ℃, sieving by a 400-mesh sieve to obtain palygorskite powder, dissolving the palygorskite powder and benzoyl peroxide with the mass of 0.6 time of that of the palygorskite powder in toluene, carrying out ultrasonic reaction for 4 hours at 70 ℃, carrying out suction filtration and drying, adding a product into a sodium ethoxide solution, carrying out ultrasonic oscillation for 10 hours at 60 ℃, adjusting the reaction solution to be acidic, carrying out suction filtration and drying, and obtaining carboxylated modified palygorskite powder;
(2) uniformly mixing carboxylic acid modified palygorskite powder, ethyl orthosilicate and absolute ethyl alcohol, and then adding deionized water and hydrogen fluorideCarboxylic acid modified palygorskite powder:VTetraethoxysilane:VAnhydrous ethanol:VDeionized water:VHydrogen fluorideStirring the solution to be thick, standing to obtain a composite wet gel, wherein the weight ratio of the composite wet gel to the solution is 1g, 10ml, 20ml, 8ml and 2 ml;
(3) soaking the composite wet gel in absolute ethyl alcohol, aging for 20h, filtering, drying the filter residue at 30 ℃, soaking the filter residue in a mixed solution of trimethylchlorosilane and normal hexane with a volume ratio of 1:4, taking out the gel, naturally drying, drying at 50 ℃ to obtain composite aerogel, grinding to obtain composite SiO2Aerogel particles.
Composite SiO2The aerogel particles were modified by the following treatments:
1) compounding SiO2Dispersing aerogel particles in ethylene glycol, adding sodium alkyl benzene sulfonate according to the mass ratio of 6:1, and performing ultrasonic dispersion for 0.5 h;
2) reacting diphenylmethane diisocyanate and polytetramethylene ether glycol at a molar ratio of 1:1.3 at 100 ℃ for 2h in a nitrogen atmosphere to generate an isocyanate group NCO-terminated prepolymer, adding 3 parts by weight of gelatin, and stirring for 1 h;
3) mixing the product mixed liquor of the first two steps according to the mass ratio of 1:0.6, adding 15 parts by weight of cationic starch and 1 part by weight of persulfate, stirring, reacting at 70 ℃ for 20min, centrifuging, filtering and drying to obtain modified composite SiO2Aerogel particles.
Example 4
Selecting 50% softwood pulp and 50% hardwood pulp as pulp liquid, adopting discontinuous fully-swelling pulping mode and defibering mixed pulping mode to prepare pulp with pulp degree of 50 DEG SR and wet weight of 4.5g, and adding 10% modified composite SiO by mass into the pulp liquid2Aerogel particles, composite SiO2The aerogel particles are dispersed in ethylene glycol by ultrasonic wave and fully stirred with the pulp slurry for 6 hours. Then the paper passes through a pressure screen, a three-section desander and a rotor screen in sequence, 3kg/t of cationic starch of paper is added at the pressure screen, then the stainless steel lining paper is obtained through the steps of paper making, calendaring and paper rolling, the paper is made to pass through a single cylinder paper machine carrier roller, and the middle height of the single cylinder paper machine carrier roller is 0.25 mm.
The composite SiO2The aerogel particles were prepared as follows: (1) calcining palygorskite at 280 deg.C, sieving with 500 mesh sieve to obtain palygorskite powder, palygorskite powder and its massDissolving 0.5 time of benzoyl peroxide in toluene, performing ultrasonic reaction for 3 hours at 80 ℃, performing suction filtration and drying, adding a product into a sodium ethoxide solution, performing ultrasonic oscillation for 7 hours at 70 ℃, adjusting the reaction liquid to be acidic, performing suction filtration and drying to obtain carboxylated modified palygorskite powder;
(2) uniformly mixing carboxylic acid modified palygorskite powder, ethyl orthosilicate and absolute ethyl alcohol, and then adding deionized water and hydrogen fluorideCarboxylic acid modified palygorskite powder:VTetraethoxysilane:VAnhydrous ethanol:VDeionized water:VHydrogen fluoride1g to 9ml to 30ml to 9ml to 1.5ml, stirring the solution to be thick, and standing to obtain composite wet gel;
(3) soaking the composite wet gel in absolute ethyl alcohol, aging for 25h, filtering, drying the filter residue at 50 ℃, soaking the filter residue in a mixed solution of trimethylchlorosilane and normal hexane with a volume ratio of 1:4, taking out the gel, naturally drying, drying at 70 ℃ to obtain composite aerogel, grinding to obtain composite SiO2Aerogel particles.
Composite SiO2The aerogel particles were modified by the following treatments:
1) compounding SiO2Dispersing aerogel particles in ethylene glycol, adding sodium alkyl benzene sulfonate according to the mass ratio of 20:1, and performing ultrasonic dispersion for 0.8 h;
2) reacting diphenylmethane diisocyanate and polytetramethylene ether glycol at 70 ℃ for 8 hours in a nitrogen atmosphere to generate an isocyanate group NCO-terminated prepolymer, adding 1 part by weight of gelatin, and stirring for 0.5 hour;
3) mixing the products of the first two steps, adding 12 parts by weight of cationic starch and 3 parts by weight of persulfate, stirring, reacting at 50 ℃ for 60min, centrifugally filtering, and drying to obtain the modified composite SiO2Aerogel particles.
Example 5
Selecting 50% softwood pulp and 50% hardwood pulp as pulp liquid, adopting discontinuous fully-swelling pulping mode and defibering mixed pulping mode to prepare pulp with pulp degree of 50 DEG SR and wet weight of 4.5g, and adding 10% modified composite SiO by mass into the pulp liquid2Aerogel particles, composite SiO2Ultrasonic dispersion of aerogel particles in ethylene glycolAnd fully stirring the pulp and the pulp slurry for 6 hours. Then the paper passes through a pressure screen, a three-section desander and a rotor screen in sequence, 3kg/t of cationic starch of paper is added at the pressure screen, then the stainless steel lining paper is obtained through the steps of paper making, calendaring and paper rolling, the paper is made to pass through a single cylinder paper machine carrier roller, and the middle height of the single cylinder paper machine carrier roller is 0.25 mm.
The composite SiO2The aerogel particles were prepared as follows: (1) calcining palygorskite at 280 ℃, sieving with a 500-mesh sieve to obtain palygorskite powder, dissolving the palygorskite powder and benzoyl peroxide with the mass of 0.5 time of that of the palygorskite powder in toluene, carrying out ultrasonic reaction for 3 hours at 80 ℃, carrying out suction filtration and drying, adding a product into a sodium ethoxide solution, carrying out ultrasonic oscillation for 7 hours at 70 ℃, adjusting the reaction solution to be acidic, carrying out suction filtration and drying, and obtaining carboxylated modified palygorskite powder;
(2) uniformly mixing carboxylic acid modified palygorskite powder, ethyl orthosilicate and absolute ethyl alcohol, and then adding deionized water and hydrogen fluorideCarboxylic acid modified palygorskite powder:VTetraethoxysilane:VAnhydrous ethanol:VDeionized water:VHydrogen fluoride1g to 9ml to 30ml to 9ml to 1.5ml, stirring the solution to be thick, and standing to obtain composite wet gel;
(3) soaking the composite wet gel in absolute ethyl alcohol, aging for 25h, filtering, drying the filter residue at 50 ℃, soaking the filter residue in a mixed solution of trimethylchlorosilane and normal hexane with a volume ratio of 1:4, taking out the gel, naturally drying, drying at 70 ℃ to obtain composite aerogel, grinding to obtain composite SiO2Aerogel particles.
Composite SiO2The aerogel particles were modified by the following treatments:
1) compounding SiO2Dispersing aerogel particles in ethylene glycol, adding sodium alkyl benzene sulfonate according to the mass ratio of 10:1, and performing ultrasonic dispersion for 1 h;
2) reacting diphenylmethane diisocyanate and polytetramethylene ether glycol at 80 ℃ for 6 hours in a nitrogen atmosphere to generate an isocyanate group NCO-terminated prepolymer, adding 2 parts by weight of gelatin, and stirring for 0.8 hour;
3) mixing the products of the first two steps, adding 10 weight parts of cationic starch and 5 weight parts of persulfate, stirring, reacting at 60 deg.C for 40min, centrifugingFiltering and drying to obtain the modified composite SiO2Aerogel particles.
Comparative example 1
Selecting 50% of softwood pulp and 50% of hardwood pulp as pulp slurry, adopting a discontinuous fully-swelling pulping mode to match with a defibering and mixing pulping mode to prepare the palygorskite with the pulp degree of 50 DEG SR and the wet weight of 4.5g, calcining the palygorskite at 280 ℃, sieving the palygorskite powder with a 500-mesh sieve to obtain palygorskite powder, adding 10% of the palygorskite powder by mass into the pulp slurry, and fully stirring for 6 hours. Then the paper passes through a pressure screen, a three-section desander and a rotor screen in sequence, 3kg/t of cationic starch of paper is added at the pressure screen, then the stainless steel lining paper is obtained through the steps of paper making, calendaring and paper rolling, the paper is made to pass through a single cylinder paper machine carrier roller, and the middle height of the single cylinder paper machine carrier roller is 0.25 mm.
Comparative example 2
Selecting 50% softwood pulp and 50% hardwood pulp as pulp slurry, adopting discontinuous fully-swelling pulping mode and defibering mixed pulping mode to prepare pulp with pulp degree of 50 DEG SR and wet weight of 4.5g, and adding SiO with mass of 10% into the pulp slurry2Aerogel particles, composite SiO2The aerogel particles are dispersed in ethylene glycol by ultrasonic wave and fully stirred with the pulp slurry for 6 hours. Then the paper passes through a pressure screen, a three-section desander and a rotor screen in sequence, 3kg/t of cationic starch of paper is added at the pressure screen, then the stainless steel lining paper is obtained through the steps of paper making, calendaring and paper rolling, the paper is made to pass through a single cylinder paper machine carrier roller, and the middle height of the single cylinder paper machine carrier roller is 0.25 mm.
The composite SiO2The aerogel particles were prepared as follows: (1) mixing ethyl orthosilicate and absolute ethyl alcohol uniformly, adding deionized water and hydrogen fluorideCarboxylic acid modified palygorskite powder:VTetraethoxysilane:VAnhydrous ethanol:VDeionized water:VHydrogen fluoride9ml:30 ml:1.5ml, stirring the solution to be thick, and standing to obtain wet gel;
(2) soaking wet gel in anhydrous ethanol, aging for 25h, filtering, drying the filter residue at 50 deg.C, soaking in a mixed solution of trimethylchlorosilane and n-hexane at a volume ratio of 1:4, taking out the gel, naturally drying, oven drying at 70 deg.C to obtain composite aerogel, and grinding to obtain composite SiO2Aerogel particles.
The test data for each of the above examples is as follows:
analysis of the above table shows that the number of the pulp points of the pulped fibers is larger in the continuous pulping mode than in the discontinuous pulping mode in example 1. Comparing examples 1-2 with comparative example 2, it can be seen that the addition of aerogel is very helpful in reducing the basis weight, but the addition of aerogel alone in comparative example 2 severely reduces the folding endurance, so that the addition of palygorskite is required for improvement. Comparative example 1 only palygorskite was added without aerogel, and the quantification did not meet the requirements. It can be seen that the combination of aerogel and palygorskite is necessary. Examples 3-5 compare with example 2 for composite SiO2The aerogel is coated, so that the quantitative influence is little, but the folding endurance is improved. From the point of view of thickness and basis weight, the invention realizes that the basis weight is lower than 25g/m2The thickness of the film was maintained at a target of 0.033mm or more.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A preparation method of high-cleanness low-quantitative stainless steel lining paper is characterized by comprising the following steps: the method comprises the steps of selecting 20-40% of softwood pulp and 60-80% of hardwood pulp as pulp liquid, sequentially passing the pulp liquid through a pressure screen, a three-section desander and a rotor screen, adding cationic starch at the pressure screen, and then carrying out papermaking, calendaring and paper rolling to obtain stainless steel lining paper, wherein the weight of the stainless steel lining paper is below 25g, the papermaking passes through a single-cylinder paper machine carrier roller, and the height of the single-cylinder paper machine carrier roller is 0.25-0.3 mm.
2. The method for preparing high-cleanness low-basis weight stainless steel lining paper according to claim 1, wherein softwood pulp and hardwood pulp are bleached kraft pulp, the pulp degree is 45-55 ° SR, and the wet weight is 3.5-4.5 g.
3. The method for preparing stainless steel lining paper with high cleanness and low basis weight as claimed in claim 1 or 2, wherein the pulp liquid is prepared by discontinuous fully-swelling pulping mode in combination with defibering and mixing refining mode.
4. The method of claim 1, wherein the cationic starch is used in an amount of 1-5kg/t of paper.
5. The method for preparing stainless steel lining paper with high cleanness and low basis weight as claimed in claim 1, wherein the pulp slurry is added with compound SiO2Aerogel particles, composite SiO2Aerogel particles with the mass being 5-10% of the mass of the pulp slurry, and composite SiO2The aerogel particles are dispersed in ethylene glycol by ultrasonic wave and fully stirred with the pulp slurry for 4-6 h.
6. The method of claim 5, wherein the composite SiO is used to make a high-cleanliness low-basis-weight stainless steel liner paper2The aerogel particles were prepared as follows:
(1) calcining palygorskite at 300 ℃ under 240-fold temperature, sieving with 500-fold sieve under 300-fold temperature to obtain palygorskite powder, dissolving the palygorskite powder and benzoyl peroxide with the mass of 0.5-0.6 times of that of the palygorskite powder in toluene, performing ultrasonic reaction for 3-6h at 60-80 ℃, performing suction filtration and drying, adding a product into a sodium ethoxide solution, performing ultrasonic oscillation for 5-10h at 60-80 ℃, adjusting the reaction solution to be acidic, performing suction filtration and drying to obtain carboxylated modified palygorskite powder;
(2) uniformly mixing carboxylic acid modified palygorskite powder, ethyl orthosilicate and absolute ethyl alcohol, and then adding deionized water and hydrogen fluorideCarboxylic acid modified palygorskite powder:VTetraethoxysilane:VAnhydrous ethanol:VDeionized water:VHydrogen fluoride(8-10) ml (20-50) ml (8-10) ml (1-2) ml, stirring the solution to be thick, and standing to obtain composite wet gel;
(3) soaking the composite wet gel in anhydrous ethanol, aging for 20-28h, filtering, drying the filter residue at 30-50 deg.C, and grinding to obtain composite SiO2Aerogel particles.
7. The method for preparing stainless steel lining paper with high cleanliness and low basis weight as claimed in claim 6, wherein the step (3) is carried out by drying, immersing into a mixed solution of trimethylchlorosilane and n-hexane with a volume ratio of 1:4, taking out the gel, naturally drying, drying at 50-70 ℃ to obtain composite aerogel, and grinding.
8. The method of claim 6 or 7, wherein the SiO composition is used to prepare a stainless steel lining paper with high cleanliness and low basis weight2The aerogel particles were modified by the following treatments:
1) compounding SiO2Dispersing aerogel particles in ethylene glycol, adding sodium alkyl benzene sulfonate according to the mass ratio of (6-20) to 1, and performing ultrasonic dispersion for 0.5-1 h;
2) reacting diphenylmethane diisocyanate and polytetramethylene ether glycol at 70-100 ℃ for 2-8h in nitrogen atmosphere to generate an isocyanate group NCO-terminated prepolymer, adding 1-3 parts by weight of gelatin, and stirring for 0.5-1 h;
3) mixing the products of the first two steps, adding 10-15 parts by weight of cationic starch and 1-5 parts by weight of persulfate, stirring, reacting at 50-70 ℃ for 20-60min, centrifuging, filtering and drying to obtain modified composite SiO2Aerogel particles.
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